T-Mobile is set to unveil its latest disruptive policy later today, but a leaked banner ad may have already revealed the details of Uncarrier 4.0. First spotted by Droid Life, the online ad reveals the company’s plans to pay off termination fees when you switch over to its service. T-Mobile appears to have pulled the advertisement overnight soon after the leak was first reported.

T-Mobile’s leaked banner ad reveals a few key details, but leaves some questions unanswered. The carrier will help pay off termination fees for up to five lines when you switch to its service from AT&T, Verizon or Sprint in an attempt to attract entire families. The catch, however, is that you’ll need to trade-in your current devices, so T-Mobile’s not exactly giving away free money. It’s also likely the company will limit how much it will pay per account, meaning you may still have to pay off a portion of that termination fee yourself.

Today’s upcoming Uncarrier 4.0 announcement follows a recent attempt from AT&T to steal T-Mobile’s customers by offering $450 to anyone who switched carriers. Considering T-Mobile CEO John Legere’s promise that the competition would “be toast” after his big announcement, we assume the company will make a more generous offer than AT&T’s.

TechnoBuffalo will be covering T-Mobile’s press conference live from CES 2014 starting today at 12:30 p.m. PT, so check back later today for all your Uncarrier 4.0 news.